Lifting jack



May 24, 1932. D. w. sEsslNs LIUETINGv JACK Filed Aug. 4, 1930 d Sess In uen'or.

e Jugar nald Wzl Patented May 24, 1932 noNALnv wurgen sn-ssroNs, or FINCHLEY, LONDON, ENGLAND LITI'NG JACK Application filed Aug-ust 4,1930, Serial No This invention relates tov lift-ing jacks of the toggles or lazy-tongs kind having a screw# threaded spindle rotation of which causes extension or collapse of the jack. V

According to the invention the spindle is made hollow and may be adapted to receive a slidable rod keyed to .the spindle so that the rod mayy normally be located'within the e spindle but may be withdrawn to .any de- `sired extent so that its outer end Visin the most convenient. position for beingrotated thereby rotating the spindle. The spindle may be provided with a grease hole and( grease nipple at a suitable place and with outlet apertures for the grease lat the threaded portions and a sleeve may be provided surrounding each of the threaded portionsof the spindle so that as the grease escapes the adjacent sleeve causes it to be maintained on the spindle and spread around the threads. The sleeves may be secured to blocks having threaded apertures engaged by the threaded portions of the spindle so that as the blocks are moved together the sleeves approach each other and their contacting may serve to limit the amount of extension of the jack.

In order'that the said invention may be clearly understood and readily carried into effect, the same will now be described more fully with reference to the accompanying drawings, in which Figure l is a side elevation of a ack constructed in accordance with the invention.V

Figures 2 and 3 are a longitudinal central section and a plan view respectively of the spindle.V

Figure 4 is a section on line IV-IV of Figure 2, and

Figure 5 illustrates a detail to be referred 5 and spindle A, and enables lubricant to be 472,913, and in Great Britain June 4, 1930.

`forced into the keyway `The nipplermay be screwed `clown into engagement with the edges of. the keyway in the rod to` lock it in adjusted position. vOutlet apertures A3, A, are provided in the spindle A at the threaded portions.` ,Secured to the blocksy B1, B2, are. the sleeves E1, E2, that surround the threaded portions A1, A2, respectively ofthe'spindle A,

and serve to maintain the lubricant onf'rthe` Y spindle vand .spread4 it around `the threads. henthe'jack is being extendedor collapsed -thesleeves movealong the spindle and their contacting together serves to limit the extension of the ack. y The lefthandfend (Figures 2 and 3) of the spindle is turned down to receive awasher F between which and ,a cap F1 secured tothe end of the spindle isa spring washer F2. The right hand end ofthe spindle is also turned 'down to receive a ywasher F3 betweenwhich andthe lett hand endet` the-"-y sleeves D, D1, is a'spring' washer Ft. When the jackiscollapsed to its fullest extent the blocks B1, B'-f,will move suticiently apartto move apart therwashers'F-and F3 ,thereby `compressing the. spring washers F2, Ff, which serve (rictionallyl to Vmaintain the `spindle against inadvertent rotation due i'or example v to vibration., The extremeright hand. end of the rod C lis provided witha conical nose-G and pin G1 for engagement by a device for rotating it. The jack comprisestwo sets Lofv vfour bars H, the inner ends of theupperfb'ars being pivotally secured to a horizontal anchor platev H1 which is provided with slots of inverted T-shapedcross-section adaptedto receive the headsof bolts H2 whereby thejack may be secured to means for fixing the jack to a motor-car axle, spring,- or other suitable part.` The innervends of the lowerbarslare pivotally connected to a base memberI-F into 1' which is screwed an `upwardly extending threadedstem forming part of a plate H4, for resting upon rthe ground. The inner ends `of `corresponding barsin each set are provided with intermeshing teeth -for the purpose off: ensuring equal and opposite movementof thebars. y. It desired one of the sleeves D,1D1 may be extended as shown in Figure 5 jto provide at its outer end a support or'bearing tor thel soY as ,Y

ino

rod C, this being particularly useful for a long rod. In the modification illustrated in this figure the outer end of this sleeve D is provided with a split conical nut J which serves the purpose both of a bearing andwhen screwed tightly into the sleeve-as a clamp to maintain the rod in its adjusted position.

What I claim as my invention and desire to secure by Letters Patent .of .the United States is 1:-4

l, A lifting ,jack comprising a plurality pf bars' piv'oted together to form a toggles or lazy-tongs device, a hollow'screw threaded spindle operatively connected with said links, rotation otwhich spindle causes extension or collapse of the device, and arod located slid-ably `within the spindle and vvkeyed thereto s o that 'the rod can be withdrawn -to any desired lextent Dto bring its outer end into the most convenient position for 'being rotated thereby rotating the spindle.

2. A lifting jack comprising a plurality of bars pivoted together to vform a. toggles lo-rlazy-tongs-device, a hollow screw thread- Ved spindle operatively connected with said links, `rotation of which spindle causes extension or collapse of the device, said spindle having a lubricant inlet hole and outlet .apertures for theV lubricant located `at the p threaded portions. s

'3. A lifting jack comprising a plurality ed spindle operatively connected with said links, rotation of which spindle causes eXtension or collapse of the device, said spindle having a lubricant inlet hole and outlet apertures for the lubricant located at the threaded portions, a rod slidably located within the spindle andfkeyed thereto, said rod having a` passage providing communication between the inlet hole andv one of the outlet apertures.

,61A lifting jack comprising a plurality of bars pivoted together `to 'form a toggles forlazy-tongs device, a hollow screw threaded spindle operatively connected with said links,zr,otationof which spindle causes eX- tension or collapse of the device, anda lrod 'lloc-ated slidably withinthe spindle and-keyed 'thereto so that therod can be withdrawnfto -any'desired-extenttobringits outer end into the most convenient position for being frovforlocking the frod to Athe spindle.

y7. A liting jack comprising a plurality of bars pivoted-together to v*form-artoggles or lazy-tongs device, a hollow screw threaded spindle operatively connected kwith said links, yrotation of ywhich spindle causes eX- rtension or collapse of the device, said spindle ftatedlthereby rotatino' the-spindle, and `means having a lubricant inlet-hole-and at leastone f lubricant outlet 'aperture for supplying lubricant Jto the threads.

DNALD `WILFRED SESSIONS.

of bars pivoted together to 'form a toggles or lazy-tongs device, a hollow screw threaded spindle `operatively connected with said `links, rotation of which spindle causes eX- 'tension or collapse of A the device, said spindle having a lubricant inlet holeand outlet apertures for the lubricant located at the threaded portions, and sleeves surrounding fthespindle at the threaded portions and serving to maintain the lubricant -on the Vthv-reads and causing the lubricant to be Aspread around the threads.

4;. A lifting jackY comprising a plurality of bars pivotedV together to form a togg'les or lazy-tongs device, blocks secured to the said bars so that movement towards each other or apart of said blocks causes eXtension or collapse of the device, said blocks i having threaded apertures, a hollow screw Vthreadedspindle threaded into Said blocks Y and having a. lubricant inlet hole and out- -let aperturesfor the lubricant'at the threaded (portions, rotation of the spindle causing movement towards each other or apart of the blocks, and sleeves secured Zto the blocks and surrounding the spindle at the threaded portions and 'extending inwardly and serving -by contacting with each other to limit the amount of extension of the device,

5. A lifting jack comprising aA Aplurality off bars pivoted together to form a toggles or lazy-tongs device, a hollow screw Ithreadisa 

